The Witham Button is nigh.

The idea of the "Witham Button" is a button with a battery (or perhaps
powered by the force of pressing the button), a transmitter and a
serial number. You get a box of buttons with one receiver, which
connects to your computer by USB.

You configure (serial-number-button-press -> computer-action) pairs with
some software on your computer.

Then you place the buttons in significant places. So, I get a letter
at my post office. The postman puts the letter into the back of my
P.O. box and presses the button there. The computer in the post
office sends me a txt. That sort of thing.

My friend Fred noticed this similar (but more complicated) concept:
The Wise
Button.

My friend Dave got pictures of something simple (though large) at a
CVS. This button rings a bell in the back of the store. That wouldn't need a
computer. But we're close.